ar 
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Fig.2 Photograph of the copper lion at door of Summer Palace 
In order to meet the requirement for high precise 
determination of automobile shell, a spiral blade 
is accurately tested by refitted 19/1318. 
The accuracy of survey point in industrial photo- 
grammetry, for instance the automobile shell, is 
highly required to reach 0.1-0.2mm. For this 
reason, a high accurate control field in the 
object space should be established, which is 
determined by ratio method. Setting and levelling 
two subtense bars on the object space, the 
coordinates of control points and two end points 
of subtense bar are measured by the forward 
intersection with the approximate base. The ratio 
factor is resolved from the coordinates of two end 
points of subtense bar: 
A =AB/V(XZ-Xp) 2+ (Y, -Y3) 2 (6) 
where AB,the known length of subtense bar; X4, Y,, 
Xe. Yg,the aproximate coordinates of two end 
points. Then the correct coordinates of other 
points are calculated:. 
X=)\X', Ys AY' (7) 
The length of second subtense bar can be got from 
the calculated correct coordinates of end points, 
equalling 2000.034mm. Comparing it with its known 
length, 2000.000mm, the difference is obtained, 
amounting 0.034mm. It is obvious that the accuracy 
of this measuring method is good to close range 
control because it is without the error of 
distance survey and the influence of error of the 
angle survey on points is not great due to the 
close range. 
The test blade, placing in the center of control 
field of object space, is photographed by 19/1318 
applying washer No. C. the average photographic 
distance is about 2.5m. 
The coordinates of object points are determined by 
the space resection of photogrammetry from the 
measured coordinates of ten or more control 
points, in which the coorrection of lens 
distortion is considered. Thus the photogrammetric 
coordinates of sixteen points on blade are 
obtained. The blade is immediately measured using 
the machine for three-dimensional measurement 
(LAMBOA 5606 from Italy), in which the precision 
of point measurement come up to 6um, in the die 
factory of the Second Automobile Manufacturer in 
China. Taking the immediate measuring coordinates 
as the pseudo-true value and comparing they with 
the photogrammetric coordinates, the relative 
standard error achieves to t0.118mm. The accuracy 
is sufficient for requirement of determination of 
automobile shell. 
5 CONCLUSION 
Originally, is the phototheodolite 19/1318 mainly 
adaptable to the topographic survey, and now, is 
it fully applicable to the close range photogram- 
metry above one meter after refitted. The. 
refitting method presented in paper is simple to 
work, easy to process and convenient to operate, 
and not destroies the former instrumental 
construction. The satisfactory results was 
produced through the product application many 
times. The way of relying upon the old apparatus 
instead of the new ones could save the import 
funds. It is recommendable for the developping 
country like China. 
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